Recent content by ralkicks

See on the pic, its not just above the bay window. It's an extension to the room, so I's probably 4 or 5 m2 in total

Just had a quick look at B&Q website. 2.4mx1.2mx100mm thick Jablite insulation is £25 - I'd probably need 2 or even 3 of these, and even then they wont fully fill the 150mm deep void. It's a bit expensive compared to rockwool. Anyone know of any cheaper sources?

From memory, around 150mm deep.

Would you suggest to use something more rigid than rockwool in that case? As for the vapour barrier, what is the benefit of using one as well as just using foil backed plasterboard? And by using one, do I risk locking any moisture that gets in there in above the barrier?

Thanks for all the advice. I will pack it full with rockwool, install a vapour barrier beneath the joists and use a foil backed plasterboard. Hope it lasts!

Hmmm its beginning to sound like there isn't any up there - that room must get seriously cold in winter! Is there any benefit in completely filling the voids between the joists with insulation? ie not leaving the recommended 50mm 'ventilation gap' as there is no way to ventilate it anyway...

Hi, Thanks for the reply. Yes sorry, the house is new to us but was built in 1930s, however it has been extended at some point in the past and this bay window is part of the extension. The previous owner said the extension was there when they moved in, some 20 years ago, but he said...

Hi, How do you know if a flat roof is a warm roof? We've recently moved into a new house which has a bay window with a flat roof. The plasterboard ceiling was bowing in places so I have taken it down. There was no insulation above the plasterboard, and I can see the tongue & groove...